Re: mercruiser 888 302 auto swap???
All ford 302's are externally balanced....
302's are imbalanced by 28oz...so you need a 28oz balanced harmonic balancer and flywheel
351w are imbalanced by 50oz (and so are the H.O. 302 EFI, also uses the 351w firing order)..so you need 50oz balanced harmonic balancer and flywheel
the merc888 (ford 302) uses 351w heads and 351w cam and 351w firing order
FFI : Anyone who reads this in the future , this is a correction!
351W are imbalanced by 28oz...so you need a 28oz balanced harmonic balancer and flywheel (always have been)
302s past 80/81 are imbalanced by 50oz (and so are the H.O. 302 EFI, also uses the 351w firing order)..so you need 50oz balanced harmonic balancer and flywheel
302s prior to 80/81 had a 28oz imbalance. so if you swap to a Ford Explorer 5.0L you need to purchase the 50oz, 158 tooth flywheel. Advance Auto Parts has them in stock (93 Mustang GT) ..made in china...
the merc888 (ford 302) uses 351w heads and 351w cam and 351w firing order